The bone that is commonly referred to as the "beauty bone" is the clavicle.

Anatomy of the Clavicle:
The clavicle, also known as the collarbone, is a long, S-shaped bone located above the first rib. It connects the scapula (shoulder blade) to the sternum (breastbone) and provides support for the shoulder joint. The clavicle is the only long bone in the body that lies horizontally.

Function of the Clavicle:
The clavicle plays an important role in the movement of the shoulder and arm. It acts as a strut, holding the shoulder girdle in place and providing stability to the arm. The clavicle also helps to protect important structures, such as blood vessels and nerves, that run through the shoulder region.

Why is it called the "beauty bone"?
The clavicle is sometimes referred to as the "beauty bone" because it is often visible under the skin and can contribute to an attractive, well-defined neckline. In addition, a well-defined clavicle can indicate a person's overall level of fitness and muscular development.

In some cultures, the clavicle is considered an important symbol of beauty. For example, in ancient Egypt, women would wear jewelry that accentuated their clavicles. In modern times, many fashion models and celebrities are known for their prominent clavicles.

Conclusion:
In summary, the clavicle is an important bone that plays a crucial role in the movement and stability of the shoulder and arm. Its visible location under the skin has earned it the nickname of the "beauty bone" in some cultures.